I was talking with a friend recently about her Shire. She's an older horse and really has a hard time with summer. The humidity here in Virginia is really bad in the summer and the shire has a hard time doing anything more than a walk. She's very healthy and is fine the other 3 seasons. She spends most of her time inside her run-in all day in the summer and only comes out at night.
Would it be bad to run a window unit air conditioner in the run-in shed? She said she was considering doing it for the summer. She only has two horses and money isn't a problem. The question was, could the a/c end up causing colic or something since the horse would be going from 75 and low humidity to outside where it's 95 and humid? I read that sometimes drastic temperature changes can cause colic.
Good idea or not? If not, what is the best way to keep a horse comfortable when they aren't very heat tolerant? This poor thing just seems miserable in the summer and we haven't really hit the nasty part yet.